Outrage in Afghanistan Over Victims of Taliban Attack in Kunar Province

KABUL—Afghans on Monday mourned 21 soldiers killed in a Taliban attack on an Afghan army outpost this weekend, as new details emerged about an incident that sparked an unexpected wave of popular outrage in the country.

Early Sunday, militants staged a well-coordinated assault on an Afghan army outpost near the area of Shirghaz, in the Ghaziabad district of eastern Kunar province. In the course of an hourslong battle, a group of 40...